Align @Nullable annotation placement with Spring code style

Spring Batch uses JSpecify annotations for null safety.

Some @Nullable annotations are not placed immediately before the annotated type, as recommended by the Spring Framework reference documentation.

Examples from the current main branch:

The recommended placement is:

public static @Nullable Duration calculateDuration(...);

private final @Nullable String message;

default @Nullable JobInstance getJobInstance(...);

Align @nullable annotation placement

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